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(1/2)*(2*x-2)*(4*x+2) = 0
1/2*(2*x-2)*(4*x+2) = 0
( 2*x-2 )
2*x-2 = 0 // + 2
2*x = 2 // : 2
x = 2/2
x = 1
( 4*x+2 )
4*x+2 = 0 // - 2
4*x = -2 // : 4
x = -2/4
x = -1/2
x in { 1, -1/2 }
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